Naturalistic driving tests were conducted using real vehicles on six roads to study the level of driving comfort on two-lane mountainroads and the key influencing factors.In the tests,acceleration data of passenger cars were collected;after filtered using Matlab software,the peak value of each waveform of the measured data was extracted to obtain the cumulative frequency profiles of peak accelerations of different axes,as well as the characteristic percentile values and the root mean square (RMS) values.The results show that the longitudinal acceleration rate ax on two-lane highways is only half the deceleration rate ab in braking.The locations where the acceleration and deceleration cause occupants discomfort account for 6％ of the total test points at the most.The ratio of road sections where occupants feel discomfort in lateral direction ranges from 7％ to 10％ of the total trip;Among all the axial accelerations,lateral acceleration ay,braking acceleration ab,the longitudinal acceleration ax and vertical acceleration az make the greatest part of contribution to the discomfort.%为了掌握山区双车道公路的行驶舒适性水平及其关键影响因素,在6条公路上开展了自然驾驶行为试验,采集了多款小客车的加速度连续变化曲线,用Matlab软件对实测数据进行滤波,提取了加速度曲线每个波形的峰值,得到了不同轴向加速度的峰值累积频率曲线、特征分位值和均方根值.试验研究结果表明:纵向加速度幅值要比制动减速度低50％,在试验道路上汽车加(减)速导致乘员不舒适的位置比例最高达6％;乘员在实际行驶中感受横向不舒适的路段比例为7％～10％;在各轴向的加速度中,对人体不适贡献依次是横向加速度ay、制动加速度ab、纵向加速度ax和竖向加速度az.
展开▼
